I love A body Mopar projects. Getting a lot of rubber underneath a '71 Scamp is gonna be an issue unless you tub it. We ran a '71 Dart back in the 80's and without modifying the wheel wells and using the most accurate wheel offsets we could calculate we were still only able to wedge a 9"wide tire in there.
Is the 360 a magnum or an earlier LA style 360?
BSE Racing Engines